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Патент USA US2404806

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July 30, 1946.
H. A. Mans“
SUBMARINE DETECTOR
Original Filed March 19,‘ 1942
2,404,806
Patented July 30, 1946
2,404,806‘
UNITED STATES PATENT oFFicE-Tf: .
2,404,806
SUBMARINE DETECTOR
Henry A. D. Lindsey, United States Army, Hickam
Field, Honolulu, Territory vof Hawaii
Original application March 19, 1942, Serial No.
435,263, now Patent No. 2,379,447, dated July :3,
1945. Divided and this application March v29,
1943, Serial No. 480,955
5 Claims.
(Cl. 177-1385’)
(Granted under the act of March '3, ‘1883, as
amended April ‘30, 1928 ; 370 ‘0. G. 757)
1
.2
.
.
the pre-ampli?er .in the housing 18,, it insures
the prevention of accidental operation because .of
the plane disturbances and alsoiinsures that there
The invention described herein may be manu
factured and used by or .for the Government for
governmental purposes, without payment to me
of any royalty thereon.
This application is a division of my copending
will be sui?cient impulse generated .to overcome
any losses which may .be present in the output
application Serial No. 435,263, ?led March 19,
cable l9.
.
_
I
The ampli?ed impulses are led through the
output cable I!) to a high-gain. ampli?er '22” the
output of which is fed to a suitable indicating de
1942, Patent No. 2,379,447, July 3, 1945, entitled
“Anti-submarine device.”
This invention relates to submarine detectors
vice 23. The indicating device 23 may be ar
ranged to give any desired type of indication _
either in the form of an audio signal or a visual
signal, or a combination of both, and at ‘the
same time may be arranged to release a smoke
It is an object of this invention to provide a
submarine detector which may be carried by an 15 bomb or flare attached to the'housing ‘I8. ‘This
will mark the spot and identify the ‘location of’
aeroplane or other aircraft and which will be
the submarine, enabling the bombardier to make '
particularly suitable for use during night opera
successive attacks during hours of darkness.
tions.
and more particularly to a device in which the
detection is made by picking up the electromag
netic ?ux generated by the motor or battery
charger of the submarine.
Referring to Fig. 2 it will be seen that the
It is another object of my invention to provide
a submarine detector which will be positive in its 20 scanning plane I8 is towed from an aeroplane ‘by
the output cable l9‘ by means of which it may
operation and of simple and inexpensive con
be lowered from the plane until it is gliding close
struction.
to the surface ofthe ‘water. As it enters ‘the
These and other objects of my invention will
electromagnetic ?eld 6 generated‘ by the sub
become appa ent upon a consideration of the fol
lowing cletai ed description when taken in con—
junction with‘ the accompanying drawing, in
which—
Fig. l is a schematic diagram of the circuit; and
Fig. 2 is a diagrammatic representation illus
. marine 4, the unbalance of the circuit as de
scribed above will take place and the pilot of
the plane 28 will be placed on notice of the pres-_
ence of the submarine.
'
‘While I have illustrated my device for usein
trating the manner of use of an embodiment .of 30 connection with an aeroplane, it is clear that any
towing device may be used so long as the scan-w
the invention.
ning plane I8 is kept at a suf?cient distance ‘from
Referring to Fig. 1 it will be seen that there is
the towing device to be free ‘from the electromag
provided an electromagnetic pickup device 1 com
netic pulses generated .by such towing device.
prising two crossed magnetic cores 8 of conven
Accordingly, I do not wish to ‘be limited to the
tional core material about which are placed ‘the
balanced coils 9. By arranging the coils 9 in this
particular ‘details of assembly shown since var'ie
manner each pair thereof will be linked to a com
ous modi?cations within the spirit of the inven-vv
mon magnetic circuit through the core *8 so that
tion will suggest themselves to those skilled in
practically all of the ?ux of one coil links with
the other thus materially increasing the total in
ductions of the two coils and in consequence the
the art.
40
-
Having ‘thus described my invention, What I
claim as new and wish to secure by Letters Pat
sensitivity of said pickup devices. Lead wires ID
ent is:
are connected to the primary of the balanced
1. .In a submarine detecting apparatus adapt
transformer H. The output of the balanced
ed to cooperate with a variable magnetic ?eld
transformer l I is fed into a class B ampli?er ‘con 45 created immediately above the surface of a body
sisting of two or more tubes l 5 and IS. The out
of water by the electrical equipment of a sub
put of the ?nal tube is fed through transformer
marine submerged beneath such surface, the coin
2| to the output cable l9. By utilizing class B
bination of a towing plane, a miniature scanning
operation, there will result a minimum drain on
plane attached to the towing plane andadapted
the batteries which will prolong the life thereof.
Upon an impulse in the coils 9, the transform
to be drawn through said magnetic ?eld in scan
ning relation with respect to the surface of said
body of water, a pickup unit in connection with
said scanning plane, said unit including a mag
netic induction device and an amplifying sys-y'v
er ll will become unbalanced and cause a cur-
rent to flow in the ampli?er circuit. The electro
magnetic pickup and the pro-ampli?er are car
ried in a suitable scanning plane l8. By placing 55 tem provided with input and output circuits, said;
2,404,806
3
4
induction device comprising two pairs of rela
tively stationary coils, the coils of each pair
thereof-being :series connected and adapted to
tremities of said cores, the respective pairs of
coils being relatively stationary and connected
‘in electrical ‘opposition ,to ‘the input, circuit of
said amplifying system through said balanced
be linked to vthe samemagnetic circuit, the re
spective pairs of coils being arranged in planes
normal to each other and connected in electrical
transformer whereby no current ?ow occurs in
the coils of said device during its passage through
a uniform magnetic ?eld but when said device
opposition to the input of said amplifying sys
is drawn through a variable magnetic field the
tem whereby no current flow occurs in the coils
current generated in its coils by the variations
of said device during its passage through a uni
of the magnetic ?eld and the spaced position
form magnetic ?eld, but when said .device is
therein of said coils will produce a current ?ow
drawn through a variable magnetic ?eld, the cur
in the input and output circuit of said amplify
rent induced in its coils by the variations of the
ing system, and an electrical indicator carried
magnetic ?eld and the spaced position therein of
by said towinglplane and in electrical relation
said coils, will produce a current ?ow in the
input and output circuits of said amplifying 15 with the output circuit of said amplifying sys
tem, said indicator being responsive to the cur
system, and an indicator carried by said towing
rent flow in the output circuit of said amplifying
plane and in electrical relation with the output
system to indicate the presence of said subma
circuit of said amplifying system, said indicator
rine under conditions precluding the transmis
being responsive to the current flow in said out
sion thereto of detectable impulses.
put circuit to indicate the presence of said sub
marine under conditions precluding the trans
mission thereto of detectable impulses.
2. In a submarine detecting apparatus adapted
4. In a submarine detecting apparatus adapted
to cooperate with a variable magnetic ?eld cre
ated immediately above the surface ofa body of
to cooperate with a variable magnetic ?eld cre
water by the electrical equipment of a submarine
ated immediately above the surface of a body of 25 submerged beneath such surface, the combina
water by the electrical equipment of a subma
tion of a towing plane, a miniature scanning
rine submerged beneath such surface, the com
plane attached to the towing plane and adapted
bination of a towing plane, a miniature Scanning
to be drawn through said magnetic ?eld in scan
plane attached to the towing plane and adapted
ning relation with respect to the surface of said
to be drawn through said magnetic ?eld in scan 30 body of water, a pickup unit in connection with
ning relation with respect to the surface of said
said scanning plane including a magnetic in
body of water, a pickup unit in connection with
duction device, a balanced transformer and an
said scanning plane, said unit including a mag
amplifying system provided with input and out
netic induction device, a balanced transformer
put circuits, said induction device comprising a
and an amplifying system provided with input 35 pair of magnetic cores, one of said cores being
and output circuits, said induction device com
disposed in a plane normal to that of the other
prising two pairs of relatively stationary coils the
of said cores, relatively stationary coils formed
coil of each pair thereof being series connected
upon the extremities of said cores, the two coils
and adapted to be linked to the same magnetic
of each corebeing series connected and adapted
circuit, the respective pairs of coils being ar— 40 to be linked to the same magnetic circuit through
ranged in planes normal to each other and con
the core common to said coils, the respective pairs
nected in electrical opposition to the input of
of coils on each of said cores being connected in
said amplifying system through said balanced
electrical opposition to the input of said ampli
transformer whereby no current flow occurs in
fying system through said balanceditransformer
the coils of said device during its passage through 45 whereby no current flow occurs in the coilsof
a uniform magnetic ?eld, but when said device
said device during its passage through a uniform
is drawn through a variable magnetic ?eld the
magnetic ?eld but when said device is drawn
current induced in its coils by the variations of
through a variable magnetic ?eld with variations
the magnetic ?eld and the spaced position therein
thereof and spaced position therein of said coils
of said coils will produce a current flow in the 50 will induce a current in said coils and produce
input and output circuits of said amplifying sys
the current ?ow in the input and output circuits
tem and an indicator carried by said towing
of said amplifying system, and an indicator car~
plane and in electrical relation with the out
ried by said towing plane and in electrical re
put circuit of said amplifying system, said indi
lation with the output circuit of said amplifying
cator being responsive to current ?ow in said 55 system, said indicator being responsive to the
output circuit to indicate the presence of said
current flow in said output circuit to indicate
submarine under conditions precluding the trans
the presence of said submarine under conditions
mission thereto of detectable impulses.
precluding the transmission thereto of detectable
impulses.
.
3. In a submarine detecting apparatus adapted
to cooperate with a variable magnetic ?eld cre 60
5. In a, submarine detecting apparatus adapted
ated immediately above the surface of a body of
to cooperate with a variable magnetic ?eld cre
water by the electrical equipment of a subma
ated immediately above the surface of a body
rine submerged beneath such surface, the com
of water by the electrical equipment of a sub
bination of a towing plane, a miniature scanning
marine submerged beneath such surface, the
plane attached to the towing plane and adapted
combination of a towing plane, a miniature scan
to be drawn through said magnetic ?eld in scan
ning relation with respect to the surface of said
body of water, a pickup unit in connection with
said scanning plane said unit including a mag
netic induction device, a balanced transformer 70
ning plane attached to the towing plane and
and an amplifying system provided with input
and output circuits, said induction device com
prising a pair of magnetic cores, one of said cores
being disposed in a plane normal to that of the
other of said cores, coils formed upon the ex
adapted to be drawn through said variable mag
netic ?eld in scanning relation With respect to
the surface of said body of water, a pick-up unit
within said scanning plane, said unit including
an output circuit and a magnetic induction de
vice connected therewith, said device comprising
a series of relatively stationary coils connected
to said output circuit and arranged in a‘ manner
such that no current-(?ow occurs in the‘ coils of
2,404,806
5
said induction device during its passage through
aboard said towing plane in electrical relation
a uniform magnetic ?eld but when said device
is drawn through a variable magnetic ?eld the
current generated in its coils by the variations
of the magnetic ?eld and the relative position
therein of said coils will produce a current flow
in said output circuit and an electrical indicator
with said output circuit and responsive to the
current flow therein to indicate the presence of
said submarine under conditions precluding the
transmission thereto of detectable impulses.
HENRY A. D. LINDSEY.
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